CBSE Class 9 Science Atoms and Molecules MCQs
Question : If isotopic distribution of C-12 & C-14 is 98% and 2% respect(d)ely, then number of C-14 atoms in 12 g of C is: (a) 1.244X1022 (b) 1.244X1023 (c) 3.88X1022 (d) 3.88X1022 Answer : A Question : Identify the correct symbol of gold: (a) Go (…
CBSE Class 9 Science Is Matter Around us Pure MCQs
Question. When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to: a. Decrease in solubility on decreasing temperature b. Decrease in solubility on increasing temperature c. Decrease in solubility on decreasing pressure d. Decrease…
CBSE Class 10 Science HOTs Periodic Classification of Elements
MCQ Questions for NCERT Class 10 Science Periodic Classification of Elements Question. Pick out the chemically most reactive elements from the given triads. Li, Na, K F, Cl, Br (a) Li and F (b) Li and Br (c) K and F (d) K and Br Answer : C Question. Identify the…
CBSE Class 10 Science HOTs Metals and Non Metals
METALS & NON-METALS Question : The metallic lustre exhibited by sodium is explained by : (B) oscillation of mobile (A) diffusion of sodium ions valence electrons (C) existence of free protons (D) existence of body centered cubic lattice Answer : B Question : Which of the…
CBSE Class 10 Science HOTs Chemical Reactions and Equations
Question. Zinc reacts with silver nitrate to form which compounds? (a) Zn (NO3)2 + Ag (b) ZnNO3 + Ag (c) AgNO3 + Zn (NO3)2 (d) Ag + Zn (NO3)3 Answer : A Question. Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) → Fe3O4(g) + 4H2(g) (i)…
CBSE Class 10 Science Chemistry Study of properties of HCI Acid and NaOH Assignment
CBSE Class 10 Science Chemistry Study of properties of HCI Acid and NaOH Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in…
CBSE Class 10 Science Chemistry Saponification Preparation of Soap Assignment
CBSE Class 10 Science Chemistry Saponification Preparation of Soap Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination.…
CBSE Class 10 Science Chemistry Properties of Acetic Acid Assignment
CBSE Class 10 Science Chemistry Properties of Acetic Acid Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents…
CBSE Class 10 Science Periodic Classification Of Elements Assignment Set C
1-MARK QUESTIONS Question : Mention one reason why elements should be classified? Question : Write two reasons responsible for late discovery of noble gases . Question : Chlorine, Bromine and Iodine form a Dobereiner’s triad. The atomic masses of chlorine and iodine are 35.…
CBSE Class 10 Science Metals and Non Metals Assignment Set A
Question. Generally metals react with acids to give salt and hydrogen gas. Which of the given acids does not give hydrogen gas on reacting with metals (except Mn and Mg)? (a) H2SO4 (b) HCl (c) HNO3 (d) All the these Answer : C Question. Which of the following…
CBSE Class 10 Science Chemistry Displacement Reaction and Reactivity Series Assignment
CBSE Class 10 Science Chemistry Displacement Reaction and Reactivity Series Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in…
CBSE Class 10 Science Chemistry Different Types of Chemical Reactions Assignment
CBSE Class 10 Science Chemistry Different Types of Chemical Reactions Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination.…
CBSE Class 10 Science Chemistry Determination of pH Assignment
CBSE Class 10 Science Chemistry Determination of pH Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should…
CBSE Class 10 Science Chemistry Cleaning Capacity of Soap Assignment
CBSE Class 10 Science Chemistry Cleaning Capacity of Soap Assignment. Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents…
CBSE Class 10 Science Carbon and its compounds Assignment Set E
Important MCQs for NCERT Class 10 Science Carbon and its Compounds Question : Which of the following structures correctly represents the electron dot structure of a chlorine molecule: Answer : A Question : While cooking, if the bottom of the vessel is getting…